﻿using Nethereum.Contracts.Services;
using Nethereum.ABI;
using Nethereum.ABI.FunctionEncoding.Attributes;
using System.Threading.Tasks;
using Nethereum.Hex.HexConvertors.Extensions;
using System.Linq;
using Nethereum.Util;

namespace Nethereum.Contracts.Standards.ERC6492
{
    public class ERC6492Service : IERC6492Service
    {
        public const string MAGIC_SUFFIX = "6492649264926492649264926492649264926492649264926492649264926492";

        private readonly IEthApiContractService _ethApiContractService;

        public ERC6492Service(IEthApiContractService ethApiContractService)
        {
            _ethApiContractService = ethApiContractService;
        }

        public byte[] BuildSignature(string create2FactoryAddress, byte[] factoryCallData, byte[] originalSignature)
        {
            var abiEncoder = new ABIEncode();
            var encodedSignature = abiEncoder.GetABIEncoded(new ABIValue(new AddressType(), create2FactoryAddress),
                                     new ABIValue(new BytesType(), factoryCallData),
                                     new ABIValue(new BytesType(), originalSignature));
            return encodedSignature.Concat(MAGIC_SUFFIX.HexToByteArray()).ToArray();
        }

        public bool IsERC6492Signature(byte[] signature)
        {
            return signature.ToHex().EndsWith(MAGIC_SUFFIX);
        }

        public bool IsERC6492Signature(string signature)
        {
            return signature.EndsWith(MAGIC_SUFFIX);
        }

#if !DOTNET35
        public async Task<bool> IsValidSignatureAsync(string signer, string create2FactoryAddress, byte[] factoryCallData, byte[] hash, byte[] originalSignature)
        {
            var signature = BuildSignature(create2FactoryAddress, factoryCallData, originalSignature);
            return await IsValidSignatureAsync(signer, hash, signature);
        }

        public async Task<bool> IsValidSignatureMessageAsync(string signer, byte[] plainMessage, byte[] signature)
        {
            var messageHasher = new EthereumMessageHasher();
            var hash = messageHasher.HashPrefixedMessage(plainMessage);
            return await IsValidSignatureAsync(signer, hash, signature);
        }

        public async Task<bool> IsValidSignatureMessageAsync(string signer, string plainUTF8Message, byte[] signature)
        {
            var messageHasher = new EthereumMessageHasher();
            var hash = messageHasher.HashPrefixedMessage(plainUTF8Message);
            return await IsValidSignatureAsync(signer, hash, signature);
        }

        public async Task<bool> IsValidSignatureAsync(string signer, byte[] hash, byte[] signature)
        {
            var validationMessage = new UniversalValidatorDeployment();
            validationMessage.Hash = hash;
            validationMessage.Signature = signature;
            validationMessage.Signer = signer;
            var callData = validationMessage.CreateCallInput();
            var response = await _ethApiContractService.Transactions.Call.SendRequestAsync(callData);
            var boolType = new BoolType();
            var responseDecoded = boolType.Decode<bool>(response.HexToByteArray());
            return responseDecoded;

        }

#endif

        public class UniversalValidatorDeployment : ContractDeploymentMessage
        {
            public static string BYTECODE = "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";
            public UniversalValidatorDeployment() : base(BYTECODE) { }
            public UniversalValidatorDeployment(string byteCode) : base(byteCode) { }
            [Parameter("address", "_signer", 1)]
            public virtual string Signer { get; set; }
            [Parameter("bytes32", "_hash", 2)]
            public virtual byte[] Hash { get; set; }
            [Parameter("bytes", "_signature", 3)]
            public virtual byte[] Signature { get; set; }
        }

    }


}
